linux-kernel - [PATCH v5 00/11] Add support for AD7091R-2/-4/-8

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Date: Tue, 19 Dec 2023 17:25:04 -0300
From: Marcelo Schmitt <marcelo.schmitt@...log.com>
To: <apw@...onical.com>, <joe@...ches.com>, <dwaipayanray1@...il.com>,
        <lukas.bulwahn@...il.com>, <paul.cercueil@...log.com>,
        <Michael.Hennerich@...log.com>, <lars@...afoo.de>, <jic23@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <dan.carpenter@...aro.org>,
        <dlechner@...libre.com>, <marcelo.schmitt1@...il.com>
CC: <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 00/11] Add support for AD7091R-2/-4/-8

From: Marcelo Schmitt <marcelo.schmitt1@...il.com>

----------------- Updates -----------------

Applied all suggestions. 
Only submitting patches not applied on v4:
Patches after ("Align arguments to function call parenthesis").

Change log v4 -> v5:
- Patch 1: Event callbacks
  * Moved to begin of the series to easy backport;
  * Reverted to original event attributes;
  * Reworked event configuration to do per direction per channel enable/disable;
  * Improved commit message;
  * Added fixes tag;
  * Added Suggested-by tag.
- Patch 2: Enable internal vref
  * Added fixes tag and improved commit message;
  * Now earlier in the series to easy backport;
  * Used regmap_set_bits() to make code more neat.
- Patch 3: Move generic AD7091R code
  * event specs moved earlier in patch 1.
- Patch 4: Move chip init data
  * Renamed field to make initialization clearer: irq_info -> info_irq.
  * Fixed ad7091r_init_info initialization by passing pointers to info structs;
- Patch 10: Add ad7091r8 support
  * Moved bitfield.h include to patch event callbacks patch;
  * Dropped GPIO consumer include on ad7091r-base.h and added gpio_desc;
  * Removed extra space before devm_gpiod_get_optional().

So, since we are already fixing a few things here, maybe it's a good time to
comment about the event ABI.
I see the event config files under events directory appearing as
in_voltage0_thresh_falling_value
in_voltage0_thresh_rising_value
in_voltage1_thresh_falling_value
and so on.
They don't have the `_raw` part of the name as documented in the IIO ABI [1].
Not sure if that is how it's intended to be, the driver is still missing
something, or maybe ABI is somehow outdated.
Anyway, if that is also something to be fixed then let me know I'll have a look
at it.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git/tree/Documentation/ABI/testing/sysfs-bus-iio#n887

Thanks,
Marcelo

----------------- Context -----------------

This series adds support for AD7091R-2/-4/-8 ADCs which can do single shot
or sequenced readings. Threshold events are also supported.
Overall, AD7091R-2/-4/-8 are very similar to AD7091R-5 except they use SPI interface.

Changes have been tested with raspberrypi and eval board on raspberrypi kernel
6.7-rc3 from raspberrypi fork.
Link: https://wiki.analog.com/resources/tools-software/linux-drivers/iio-adc/ad7091r8


Marcelo Schmitt (11):
  iio: adc: ad7091r: Allow users to configure device events
  iio: adc: ad7091r: Enable internal vref if external vref is not
    supplied
  iio: adc: ad7091r: Move generic AD7091R code to base driver and header
    file
  iio: adc: ad7091r: Move chip init data to container struct
  iio: adc: ad7091r: Remove unneeded probe parameters
  iio: adc: ad7091r: Set device mode through chip_info callback
  iio: adc: ad7091r: Add chip_info callback to get conversion result
    channel
  iio: adc: Split AD7091R-5 config symbol
  dt-bindings: iio: Add AD7091R-8
  iio: adc: Add support for AD7091R-8
  MAINTAINERS: Add MAINTAINERS entry for AD7091R

 .../bindings/iio/adc/adi,ad7091r5.yaml        |  82 +++++-
 MAINTAINERS                                   |   8 +
 drivers/iio/adc/Kconfig                       |  16 ++
 drivers/iio/adc/Makefile                      |   4 +-
 drivers/iio/adc/ad7091r-base.c                | 269 +++++++++++------
 drivers/iio/adc/ad7091r-base.h                |  83 +++++-
 drivers/iio/adc/ad7091r5.c                    | 120 ++++----
 drivers/iio/adc/ad7091r8.c                    | 272 ++++++++++++++++++
 8 files changed, 714 insertions(+), 140 deletions(-)
 create mode 100644 drivers/iio/adc/ad7091r8.c

-- 
2.42.0